What are ways to earn 50 bucks in the summer?

So it's actually not for me, it's for my little sister.
She's 13 and she's saving up for a iPhone 5c and she only needs 50 dollars more. Please don't say lemonade stand or babysitting because she already tried lemonade and our parents won't let her babysitt.

Cut Neighbors grass. You can normally charge 25-30 dollars per cut

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